drivers/gpu/drm/i915/display/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/console.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/string.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/tty.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43
  44 #include "gem/i915_gem_lmem.h"
  45
  46 #include "i915_drv.h"
  47 #include "intel_display_types.h"
  48 #include "intel_fb.h"
  49 #include "intel_fb_pin.h"
  50 #include "intel_fbdev.h"
  51 #include "intel_frontbuffer.h"
  52
  53 struct intel_fbdev {
  54         struct drm_fb_helper helper;
  55         struct intel_framebuffer *fb;
  56         struct i915_vma *vma;
  57         unsigned long vma_flags;
  58         async_cookie_t cookie;
  59         int preferred_bpp;
  60
  61         /* Whether or not fbdev hpd processing is temporarily suspended */
  62         bool hpd_suspended: 1;
  63         /* Set when a hotplug was received while HPD processing was suspended */
  64         bool hpd_waiting: 1;
  65
  66         /* Protects hpd_suspended */
  67         struct mutex hpd_lock;
  68 };
  69
  70 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  71 {
  72         return ifbdev->fb->frontbuffer;
  73 }
  74
  75 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  76 {
  77         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  78 }
  79
  80 static int intel_fbdev_set_par(struct fb_info *info)
  81 {
  82         struct drm_fb_helper *fb_helper = info->par;
  83         struct intel_fbdev *ifbdev =
  84                 container_of(fb_helper, struct intel_fbdev, helper);
  85         int ret;
  86
  87         ret = drm_fb_helper_set_par(info);
  88         if (ret == 0)
  89                 intel_fbdev_invalidate(ifbdev);
  90
  91         return ret;
  92 }
  93
  94 static int intel_fbdev_blank(int blank, struct fb_info *info)
  95 {
  96         struct drm_fb_helper *fb_helper = info->par;
  97         struct intel_fbdev *ifbdev =
  98                 container_of(fb_helper, struct intel_fbdev, helper);
  99         int ret;
 100
 101         ret = drm_fb_helper_blank(blank, info);
 102         if (ret == 0)
 103                 intel_fbdev_invalidate(ifbdev);
 104
 105         return ret;
 106 }
 107
 108 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 109                                    struct fb_info *info)
 110 {
 111         struct drm_fb_helper *fb_helper = info->par;
 112         struct intel_fbdev *ifbdev =
 113                 container_of(fb_helper, struct intel_fbdev, helper);
 114         int ret;
 115
 116         ret = drm_fb_helper_pan_display(var, info);
 117         if (ret == 0)
 118                 intel_fbdev_invalidate(ifbdev);
 119
 120         return ret;
 121 }
 122
 123 static const struct fb_ops intelfb_ops = {
 124         .owner = THIS_MODULE,
 125         DRM_FB_HELPER_DEFAULT_OPS,
 126         .fb_set_par = intel_fbdev_set_par,
 127         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 128         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 129         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 130         .fb_pan_display = intel_fbdev_pan_display,
 131         .fb_blank = intel_fbdev_blank,
 132 };
 133
 134 static int intelfb_alloc(struct drm_fb_helper *helper,
 135                          struct drm_fb_helper_surface_size *sizes)
 136 {
 137         struct intel_fbdev *ifbdev =
 138                 container_of(helper, struct intel_fbdev, helper);
 139         struct drm_framebuffer *fb;
 140         struct drm_device *dev = helper->dev;
 141         struct drm_i915_private *dev_priv = to_i915(dev);
 142         struct drm_mode_fb_cmd2 mode_cmd = {};
 143         struct drm_i915_gem_object *obj;
 144         int size;
 145
 146         /* we don't do packed 24bpp */
 147         if (sizes->surface_bpp == 24)
 148                 sizes->surface_bpp = 32;
 149
 150         mode_cmd.width = sizes->surface_width;
 151         mode_cmd.height = sizes->surface_height;
 152
 153         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 154                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 155         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 156                                                           sizes->surface_depth);
 157
 158         size = mode_cmd.pitches[0] * mode_cmd.height;
 159         size = PAGE_ALIGN(size);
 160
 161         obj = ERR_PTR(-ENODEV);
 162         if (HAS_LMEM(dev_priv)) {
 163                 obj = i915_gem_object_create_lmem(dev_priv, size,
 164                                                   I915_BO_ALLOC_CONTIGUOUS);
 165         } else {
 166                 /*
 167                  * If the FB is too big, just don't use it since fbdev is not very
 168                  * important and we should probably use that space with FBC or other
 169                  * features.
 170                  */
 171                 if (size * 2 < dev_priv->stolen_usable_size)
 172                         obj = i915_gem_object_create_stolen(dev_priv, size);
 173                 if (IS_ERR(obj))
 174                         obj = i915_gem_object_create_shmem(dev_priv, size);
 175         }
 176
 177         if (IS_ERR(obj)) {
 178                 drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
 179                 return PTR_ERR(obj);
 180         }
 181
 182         fb = intel_framebuffer_create(obj, &mode_cmd);
 183         i915_gem_object_put(obj);
 184         if (IS_ERR(fb))
 185                 return PTR_ERR(fb);
 186
 187         ifbdev->fb = to_intel_framebuffer(fb);
 188         return 0;
 189 }
 190
 191 static int intelfb_create(struct drm_fb_helper *helper,
 192                           struct drm_fb_helper_surface_size *sizes)
 193 {
 194         struct intel_fbdev *ifbdev =
 195                 container_of(helper, struct intel_fbdev, helper);
 196         struct intel_framebuffer *intel_fb = ifbdev->fb;
 197         struct drm_device *dev = helper->dev;
 198         struct drm_i915_private *dev_priv = to_i915(dev);
 199         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 200         struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
 201         const struct i915_ggtt_view view = {
 202                 .type = I915_GGTT_VIEW_NORMAL,
 203         };
 204         intel_wakeref_t wakeref;
 205         struct fb_info *info;
 206         struct i915_vma *vma;
 207         unsigned long flags = 0;
 208         bool prealloc = false;
 209         void __iomem *vaddr;
 210         struct drm_i915_gem_object *obj;
 211         int ret;
 212
 213         if (intel_fb &&
 214             (sizes->fb_width > intel_fb->base.width ||
 215              sizes->fb_height > intel_fb->base.height)) {
 216                 drm_dbg_kms(&dev_priv->drm,
 217                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 218                             " releasing it\n",
 219                             intel_fb->base.width, intel_fb->base.height,
 220                             sizes->fb_width, sizes->fb_height);
 221                 drm_framebuffer_put(&intel_fb->base);
 222                 intel_fb = ifbdev->fb = NULL;
 223         }
 224         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 225                 drm_dbg_kms(&dev_priv->drm,
 226                             "no BIOS fb, allocating a new one\n");
 227                 ret = intelfb_alloc(helper, sizes);
 228                 if (ret)
 229                         return ret;
 230                 intel_fb = ifbdev->fb;
 231         } else {
 232                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 233                 prealloc = true;
 234                 sizes->fb_width = intel_fb->base.width;
 235                 sizes->fb_height = intel_fb->base.height;
 236         }
 237
 238         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 239
 240         /* Pin the GGTT vma for our access via info->screen_base.
 241          * This also validates that any existing fb inherited from the
 242          * BIOS is suitable for own access.
 243          */
 244         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 245                                          &view, false, &flags);
 246         if (IS_ERR(vma)) {
 247                 ret = PTR_ERR(vma);
 248                 goto out_unlock;
 249         }
 250
 251         info = drm_fb_helper_alloc_fbi(helper);
 252         if (IS_ERR(info)) {
 253                 drm_err(&dev_priv->drm, "Failed to allocate fb_info\n");
 254                 ret = PTR_ERR(info);
 255                 goto out_unpin;
 256         }
 257
 258         ifbdev->helper.fb = &ifbdev->fb->base;
 259
 260         info->fbops = &intelfb_ops;
 261
 262         /* setup aperture base/size for vesafb takeover */
 263         obj = intel_fb_obj(&intel_fb->base);
 264         if (i915_gem_object_is_lmem(obj)) {
 265                 struct intel_memory_region *mem = obj->mm.region;
 266
 267                 info->apertures->ranges[0].base = mem->io_start;
 268                 info->apertures->ranges[0].size = mem->io_size;
 269
 270                 /* Use fbdev's framebuffer from lmem for discrete */
 271                 info->fix.smem_start =
 272                         (unsigned long)(mem->io_start +
 273                                         i915_gem_object_get_dma_address(obj, 0));
 274                 info->fix.smem_len = obj->base.size;
 275         } else {
 276                 info->apertures->ranges[0].base = ggtt->gmadr.start;
 277                 info->apertures->ranges[0].size = ggtt->mappable_end;
 278
 279                 /* Our framebuffer is the entirety of fbdev's system memory */
 280                 info->fix.smem_start =
 281                         (unsigned long)(ggtt->gmadr.start + vma->node.start);
 282                 info->fix.smem_len = vma->size;
 283         }
 284
 285         vaddr = i915_vma_pin_iomap(vma);
 286         if (IS_ERR(vaddr)) {
 287                 drm_err(&dev_priv->drm,
 288                         "Failed to remap framebuffer into virtual memory\n");
 289                 ret = PTR_ERR(vaddr);
 290                 goto out_unpin;
 291         }
 292         info->screen_base = vaddr;
 293         info->screen_size = vma->size;
 294
 295         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 296
 297         /* If the object is shmemfs backed, it will have given us zeroed pages.
 298          * If the object is stolen however, it will be full of whatever
 299          * garbage was left in there.
 300          */
 301         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 302                 memset_io(info->screen_base, 0, info->screen_size);
 303
 304         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 305
 306         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 307                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 308                     i915_ggtt_offset(vma));
 309         ifbdev->vma = vma;
 310         ifbdev->vma_flags = flags;
 311
 312         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 313         vga_switcheroo_client_fb_set(pdev, info);
 314         return 0;
 315
 316 out_unpin:
 317         intel_unpin_fb_vma(vma, flags);
 318 out_unlock:
 319         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 320         return ret;
 321 }
 322
 323 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 324         .fb_probe = intelfb_create,
 325 };
 326
 327 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 328 {
 329         /* We rely on the object-free to release the VMA pinning for
 330          * the info->screen_base mmaping. Leaking the VMA is simpler than
 331          * trying to rectify all the possible error paths leading here.
 332          */
 333
 334         drm_fb_helper_fini(&ifbdev->helper);
 335
 336         if (ifbdev->vma)
 337                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 338
 339         if (ifbdev->fb)
 340                 drm_framebuffer_remove(&ifbdev->fb->base);
 341
 342         kfree(ifbdev);
 343 }
 344
 345 /*
 346  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 347  * The core display code will have read out the current plane configuration,
 348  * so we use that to figure out if there's an object for us to use as the
 349  * fb, and if so, we re-use it for the fbdev configuration.
 350  *
 351  * Note we only support a single fb shared across pipes for boot (mostly for
 352  * fbcon), so we just find the biggest and use that.
 353  */
 354 static bool intel_fbdev_init_bios(struct drm_device *dev,
 355                                   struct intel_fbdev *ifbdev)
 356 {
 357         struct drm_i915_private *i915 = to_i915(dev);
 358         struct intel_framebuffer *fb = NULL;
 359         struct intel_crtc *crtc;
 360         unsigned int max_size = 0;
 361
 362         /* Find the largest fb */
 363         for_each_intel_crtc(dev, crtc) {
 364                 struct intel_crtc_state *crtc_state =
 365                         to_intel_crtc_state(crtc->base.state);
 366                 struct intel_plane *plane =
 367                         to_intel_plane(crtc->base.primary);
 368                 struct intel_plane_state *plane_state =
 369                         to_intel_plane_state(plane->base.state);
 370                 struct drm_i915_gem_object *obj =
 371                         intel_fb_obj(plane_state->uapi.fb);
 372
 373                 if (!crtc_state->uapi.active) {
 374                         drm_dbg_kms(&i915->drm,
 375                                     "[CRTC:%d:%s] not active, skipping\n",
 376                                     crtc->base.base.id, crtc->base.name);
 377                         continue;
 378                 }
 379
 380                 if (!obj) {
 381                         drm_dbg_kms(&i915->drm,
 382                                     "[PLANE:%d:%s] no fb, skipping\n",
 383                                     plane->base.base.id, plane->base.name);
 384                         continue;
 385                 }
 386
 387                 if (obj->base.size > max_size) {
 388                         drm_dbg_kms(&i915->drm,
 389                                     "found possible fb from [PLANE:%d:%s]\n",
 390                                     plane->base.base.id, plane->base.name);
 391                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 392                         max_size = obj->base.size;
 393                 }
 394         }
 395
 396         if (!fb) {
 397                 drm_dbg_kms(&i915->drm,
 398                             "no active fbs found, not using BIOS config\n");
 399                 goto out;
 400         }
 401
 402         /* Now make sure all the pipes will fit into it */
 403         for_each_intel_crtc(dev, crtc) {
 404                 struct intel_crtc_state *crtc_state =
 405                         to_intel_crtc_state(crtc->base.state);
 406                 struct intel_plane *plane =
 407                         to_intel_plane(crtc->base.primary);
 408                 unsigned int cur_size;
 409
 410                 if (!crtc_state->uapi.active) {
 411                         drm_dbg_kms(&i915->drm,
 412                                     "[CRTC:%d:%s] not active, skipping\n",
 413                                     crtc->base.base.id, crtc->base.name);
 414                         continue;
 415                 }
 416
 417                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 418                             plane->base.base.id, plane->base.name);
 419
 420                 /*
 421                  * See if the plane fb we found above will fit on this
 422                  * pipe.  Note we need to use the selected fb's pitch and bpp
 423                  * rather than the current pipe's, since they differ.
 424                  */
 425                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 426                 cur_size = cur_size * fb->base.format->cpp[0];
 427                 if (fb->base.pitches[0] < cur_size) {
 428                         drm_dbg_kms(&i915->drm,
 429                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 430                                     plane->base.base.id, plane->base.name,
 431                                     cur_size, fb->base.pitches[0]);
 432                         fb = NULL;
 433                         break;
 434                 }
 435
 436                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 437                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 438                 cur_size *= fb->base.pitches[0];
 439                 drm_dbg_kms(&i915->drm,
 440                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 441                             crtc->base.base.id, crtc->base.name,
 442                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 443                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 444                             fb->base.format->cpp[0] * 8,
 445                             cur_size);
 446
 447                 if (cur_size > max_size) {
 448                         drm_dbg_kms(&i915->drm,
 449                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 450                                     plane->base.base.id, plane->base.name,
 451                                     cur_size, max_size);
 452                         fb = NULL;
 453                         break;
 454                 }
 455
 456                 drm_dbg_kms(&i915->drm,
 457                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 458                             plane->base.base.id, plane->base.name,
 459                             max_size, cur_size);
 460         }
 461
 462         if (!fb) {
 463                 drm_dbg_kms(&i915->drm,
 464                             "BIOS fb not suitable for all pipes, not using\n");
 465                 goto out;
 466         }
 467
 468         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 469         ifbdev->fb = fb;
 470
 471         drm_framebuffer_get(&ifbdev->fb->base);
 472
 473         /* Final pass to check if any active pipes don't have fbs */
 474         for_each_intel_crtc(dev, crtc) {
 475                 struct intel_crtc_state *crtc_state =
 476                         to_intel_crtc_state(crtc->base.state);
 477                 struct intel_plane *plane =
 478                         to_intel_plane(crtc->base.primary);
 479                 struct intel_plane_state *plane_state =
 480                         to_intel_plane_state(plane->base.state);
 481
 482                 if (!crtc_state->uapi.active)
 483                         continue;
 484
 485                 drm_WARN(dev, !plane_state->uapi.fb,
 486                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 487                          plane->base.base.id, plane->base.name);
 488         }
 489
 490
 491         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 492         return true;
 493
 494 out:
 495
 496         return false;
 497 }
 498
 499 static void intel_fbdev_suspend_worker(struct work_struct *work)
 500 {
 501         intel_fbdev_set_suspend(&container_of(work,
 502                                               struct drm_i915_private,
 503                                               fbdev_suspend_work)->drm,
 504                                 FBINFO_STATE_RUNNING,
 505                                 true);
 506 }
 507
 508 int intel_fbdev_init(struct drm_device *dev)
 509 {
 510         struct drm_i915_private *dev_priv = to_i915(dev);
 511         struct intel_fbdev *ifbdev;
 512         int ret;
 513
 514         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 515                 return -ENODEV;
 516
 517         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 518         if (ifbdev == NULL)
 519                 return -ENOMEM;
 520
 521         mutex_init(&ifbdev->hpd_lock);
 522         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 523
 524         if (!intel_fbdev_init_bios(dev, ifbdev))
 525                 ifbdev->preferred_bpp = 32;
 526
 527         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 528         if (ret) {
 529                 kfree(ifbdev);
 530                 return ret;
 531         }
 532
 533         dev_priv->fbdev = ifbdev;
 534         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 535
 536         return 0;
 537 }
 538
 539 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 540 {
 541         struct intel_fbdev *ifbdev = data;
 542
 543         /* Due to peculiar init order wrt to hpd handling this is separate. */
 544         if (drm_fb_helper_initial_config(&ifbdev->helper,
 545                                          ifbdev->preferred_bpp))
 546                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 547 }
 548
 549 void intel_fbdev_initial_config_async(struct drm_device *dev)
 550 {
 551         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 552
 553         if (!ifbdev)
 554                 return;
 555
 556         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 557 }
 558
 559 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 560 {
 561         if (!ifbdev->cookie)
 562                 return;
 563
 564         /* Only serialises with all preceding async calls, hence +1 */
 565         async_synchronize_cookie(ifbdev->cookie + 1);
 566         ifbdev->cookie = 0;
 567 }
 568
 569 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 570 {
 571         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 572
 573         if (!ifbdev)
 574                 return;
 575
 576         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 577         if (!current_is_async())
 578                 intel_fbdev_sync(ifbdev);
 579
 580         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 581 }
 582
 583 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 584 {
 585         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 586
 587         if (!ifbdev)
 588                 return;
 589
 590         intel_fbdev_destroy(ifbdev);
 591 }
 592
 593 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 594  * processing, fbdev will perform a full connector reprobe if a hotplug event
 595  * was received while HPD was suspended.
 596  */
 597 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 598 {
 599         struct intel_fbdev *ifbdev = i915->fbdev;
 600         bool send_hpd = false;
 601
 602         mutex_lock(&ifbdev->hpd_lock);
 603         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 604         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 605         ifbdev->hpd_waiting = false;
 606         mutex_unlock(&ifbdev->hpd_lock);
 607
 608         if (send_hpd) {
 609                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 610                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 611         }
 612 }
 613
 614 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 615 {
 616         struct drm_i915_private *dev_priv = to_i915(dev);
 617         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 618         struct fb_info *info;
 619
 620         if (!ifbdev || !ifbdev->vma)
 621                 return;
 622
 623         info = ifbdev->helper.fbdev;
 624
 625         if (synchronous) {
 626                 /* Flush any pending work to turn the console on, and then
 627                  * wait to turn it off. It must be synchronous as we are
 628                  * about to suspend or unload the driver.
 629                  *
 630                  * Note that from within the work-handler, we cannot flush
 631                  * ourselves, so only flush outstanding work upon suspend!
 632                  */
 633                 if (state != FBINFO_STATE_RUNNING)
 634                         flush_work(&dev_priv->fbdev_suspend_work);
 635
 636                 console_lock();
 637         } else {
 638                 /*
 639                  * The console lock can be pretty contented on resume due
 640                  * to all the printk activity.  Try to keep it out of the hot
 641                  * path of resume if possible.
 642                  */
 643                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 644                 if (!console_trylock()) {
 645                         /* Don't block our own workqueue as this can
 646                          * be run in parallel with other i915.ko tasks.
 647                          */
 648                         schedule_work(&dev_priv->fbdev_suspend_work);
 649                         return;
 650                 }
 651         }
 652
 653         /* On resume from hibernation: If the object is shmemfs backed, it has
 654          * been restored from swap. If the object is stolen however, it will be
 655          * full of whatever garbage was left in there.
 656          */
 657         if (state == FBINFO_STATE_RUNNING &&
 658             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 659                 memset_io(info->screen_base, 0, info->screen_size);
 660
 661         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 662         console_unlock();
 663
 664         intel_fbdev_hpd_set_suspend(dev_priv, state);
 665 }
 666
 667 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 668 {
 669         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 670         bool send_hpd;
 671
 672         if (!ifbdev)
 673                 return;
 674
 675         intel_fbdev_sync(ifbdev);
 676
 677         mutex_lock(&ifbdev->hpd_lock);
 678         send_hpd = !ifbdev->hpd_suspended;
 679         ifbdev->hpd_waiting = true;
 680         mutex_unlock(&ifbdev->hpd_lock);
 681
 682         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 683                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 684 }
 685
 686 void intel_fbdev_restore_mode(struct drm_device *dev)
 687 {
 688         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 689
 690         if (!ifbdev)
 691                 return;
 692
 693         intel_fbdev_sync(ifbdev);
 694         if (!ifbdev->vma)
 695                 return;
 696
 697         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 698                 intel_fbdev_invalidate(ifbdev);
 699 }
 700
 701 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 702 {
 703         if (!fbdev || !fbdev->helper.fb)
 704                 return NULL;
 705
 706         return to_intel_framebuffer(fbdev->helper.fb);
 707 }